The perovskite-type oxide solid solution Ba0.98Ce0.8Tm0.2O3−α was prepared by high temperature solid-state reaction and its single phase character was confirmed by X-ray diffraction. The conduction property of the sample was investigated by alternating current impedance spectroscopy and gas concentration cell methods under different gases atmospheres in the temperature range of 500–900C. The performance of the hydrogen-air fuel cell using the sample as solid electrolyte was measured. In wet hydrogen, the sample was a pure protonic conductor with the protonic transport number of 1 in the range of 500–600C, a mixed conductor of proton and electron with the protonic transport number of 0.945-0.933 above 600C. In wet air, the sample was a mixed conductor of proton, oxide ion, and electronic hole. The protonic transport numbers were 0.010–0.021, and the oxide ionic transport numbers were 0.471-0.382. In hydrogen-air fuel cell, the sample was a mixed conductor of proton, oxide ion and electron, the ionic transport numbers were 0.942-0.885. The fuel cell using Ba0.98Ce0.8Tm0.2O3−α as solid electrolyte could work stably. At 900C, the maximum power output density was 110.2mW/cm2, which was higher than that for a previous cell using BaxCe0.8RE0.2O3−α (x ≤ 1, RE = Y, Eu, Ho) as solid electrolyte.

Ionic Conduction and Fuel Cell Performance of Ba0.98Ce0.8Tm0.2O3−α Ceramic. L.G.Qiu, M.Y.Wang: Chinese Journal of Chemical Physics, 2010, 23[6], 707